Poudretteite and Blue John Physical Properties

Poudretteite and Blue John Chemical Formula

While comparing Poudretteite and Blue John physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Poudretteite and Blue John chemical formula.

• Chemical formula of Poudretteite- KNa 2B 3Si 12O 30Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Poudretteite and Blue John Specific Gravity

Another important criteria for qualitative analysis of gemstones is Poudretteite and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Poudretteite and Blue John Optical Properties during the identification of gemstone. Specific gravity of Poudretteite is 3.00-3.25 whereas that of Blue John is 3.00-3.25.